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# Environment and Modules
## Shells on Clusters
The table shows which shells are supported on the IT4Innovations clusters.
| --------------- | ---- | ---- | --- | --- | ---- |
| Karolina | yes | yes | yes | yes | yes |
| Barbora | yes | yes | yes | yes | no |
| DGX-2 | yes | no | no | no | no |
BASH is the default shell. Should you need a different shell, contact [support\[at\]it4i.cz][3].
## Environment Customization
After logging in, you may want to configure the environment. Write your preferred path definitions, aliases, functions, and module loads in the .bashrc file
```console
# ./bashrc
# users compilation path
export MODULEPATH=${MODULEPATH}:/home/$USER/.local/easybuild/modules/all
# User specific aliases and functions
alias qs='qstat -a'
# load default intel compilator !!! is not recommended !!!
ml intel
# Display information to standard output - only in interactive ssh session
if [ -n "$SSH_TTY" ]
then
ml # Display loaded modules
fi
```
!!! note
Do not run commands outputting to standard output (echo, module list, etc.) in .bashrc for non-interactive SSH sessions. It breaks the fundamental functionality (SCP, PBS) of your account. Take care for SSH session interactivity for such commands as stated in the previous example.
### Application Modules
In order to configure your shell for running a particular application on clusters, we use a module package interface.
Application modules on clusters are built using [EasyBuild][1]. The modules are divided into the following groups:
```
base: Default module class
bio: Bioinformatics, biology and biomedical
cae: Computer Aided Engineering (incl. CFD)
chem: Chemistry, Computational Chemistry and Quantum Chemistry
compiler: Compilers
data: Data management & processing tools
debugger: Debuggers
devel: Development tools
geo: Earth Sciences
ide: Integrated Development Environments (e.g. editors)
lang: Languages and programming aids
lib: General purpose libraries
math: High-level mathematical software
mpi: MPI stacks
numlib: Numerical Libraries
perf: Performance tools
phys: Physics and physical systems simulations
system: System utilities (e.g. highly depending on system OS and hardware)
toolchain: EasyBuild toolchains
tools: General purpose tools
vis: Visualization, plotting, documentation and typesetting
OS: singularity image
python: python packages
```
!!! note
The modules set up the application paths, library paths and environment variables for running a particular application.
The modules may be loaded, unloaded, and switched according to momentary needs. For details, see [lmod][2].
[1]: software/tools/easybuild.md
[2]: software/modules/lmod.md